Well, IMHO It's F#. F# is really good due to it's better tooling and you have access to the plethora of libraries and framework of the .NET Ecosystem. Unlike Sc

Well, IMHO It's F#. F# is really good due to it's better tooling and you have access to the plethora of libraries and framework of the .NET Ecosystem. Unlike Scala or Kotlin, F# retains a lot from it's functional roots like - Automatic Currying - ML Type System Plus it adds some really innovative features like - Type Providers which allows you to lazily/automatically generate Types for real world data/systems which is pretty cool. Ultimately it boils down to the Runtime/Tools/Ecosystem which is also true for Scala and Kotlin but it retains a lot from it's OCAML Heritage which makes it lean more towards FP than it contemporaries PS - I didn't mention clojure as I don't consider dynamic languages a good fit for building large codebase backend systems